Create categories and colors

Categories connect events with the filter and give them a color. Create system categories as usual (module Records, record type Category) and assign them to feeds or calendarize events.

The extension adds the tab Fullcalendar to every category:

The Fullcalendar tab of a category with color and frontend user group restriction

Color: Color of the events of this category and of its checkbox in the filter. The color of a feed has precedence over the color of its categories.
Restrict to frontend usergroup: The category, and the events with this category, are only visible for logged-in users of one of the selected groups. The special values Hide at login and Show at any login are available, too.